import pygame
from pygame.locals import *
from sys import exit

pygame.init()
SCREEN_SIZE = (640, 480)
screen = pygame.display.set_mode(SCREEN_SIZE, 0, 32)

font = pygame.font.SysFont("arial", 16);
font_height = font.get_linesize()
event_text = []


while True:
       
    event = pygame.event.wait()        
    event_text.append(str(event))
    event_text = event_text[-SCREEN_SIZE[1]/font_height:]
        
    if event.type == QUIT:
        exit()
    
    screen.fill((255, 255, 255))
    
    y = SCREEN_SIZE[1]-font_height
    for text in reversed(event_text):        
        screen.blit( font.render(text, True, (0, 0, 0)), (0, y) )
        y-=font_height
        
    pygame.display.update()